Tricked

Are there torgue members that the clipers mount to that you are powder coating as well?

I've done the same disassembly with another set of rear calipers with built in parking brakes. I left the bearing in, told the shop to take care not to get any sand blasting media in them, had the powder coated. Once I got them back, I had sprayed out the bearings with a cleaner and compressed air to get out any possible blasting media and the old hardened grease. I repaced them with grease, reassembled them and haven't had an issue since.